Four pairs of terms are given as: (i) \[16a\] and \[16b\] (ii) \[12ab\] and \[13ab\] (iii) \[-8xy\]and \[10yx\] (iv) \[8ab\] and \[8ac\] Which two given pairs are pairs of like terms?

• A.  (i) and (iv)     
• B.  (i) and (iii)      
• C.  (ii) and (iii)
• D.  (ii) and (iv)